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Design features and characteristics of conventional, modified and shielded total‐pressure probes are briefly discussed, and compared with new shielded instruments of simple construction which combine smallness of size with adequately fast response to pressure changes. Tests at air speeds up to 280 ft./sec. showed that a probe featuring a total‐traversing cylinder with single orifice inside a tubular shield will register total pressure to within 1 per cent of the dynamic pressure up to inclinations of the flow of ±28 deg., the error in the range ±22 deg. being less than 0.5 per cent. The response time of the instrument under a suddenly applied air pressure of 500 mm. W.G. was less than 60 seconds when linked to a Betz projection manometer. If the inner cylinder is replaced by a central sting, the range of insensitivity to flow inclinations is increased to ±45 deg., the error being less than 0·5 per cent of the dynamic pressure. The response time of this probe under 500 mm. W.G. air pressure was approximately 100 seconds. Still simpler versions of the instruments described are under development.

A survey is made of the instruments and methods used to measure total and static pressure and direction in three‐dimensional flow. Comparative tests in a towing tank of two designs of live‐orifice pitot‐type probe showed the advantage, within a limited range of flow inclination, of the instrument with independent static pressure orifices. Speed and angle of flow characteristics are Riven for these two probes, which differed in the shape of head.

OVER A QUARTER of a century ago, in September 1938, we published a review of diffuser behaviour by G. N. Patterson which, together with one of its main information sources by Gibson, has formed the accepted guide to diffuser design. Patterson's paper was broad in scope and made clear reference to the effect of parameters which were not fully investigated until much later. It is the purpose of this paper to review experimental work, much of it being along the lines formulated by Patterson, and to indicate the improved analytical understanding of diffusers.

An analysis is given for the stresses in an insulated plate in the neighbourhood of a local hot spot. The stresses depend upon the relative size and flexibilities of plate and heated area.

A description of an experimental investigation of a round air jet projected parallel to a wall and the resulting velocity profiles, maximum velocity decay and the rate of jet growth. This paper concerns an experimental investigation of a round air jet projected parallel to a wall. Experiments were carried out to establish the shape of the velocity profiles, the decay of maximum velocity and the rate of growth of the jet. The results are compared with Tollmien's theory for the free jet. All data are presented in a form readily available for design purposes.

Current issues of Publishers' Weekly are reporting serious shortages of paper, binders board, cloth, and other essential book manufacturing materials. Let us assure you these shortages are very real and quite severe.

To the Editor. DEAR SIR, The Kiel type probe described by Winternitz can be simplified further with very little sacrifice of tolerance to angles of yaw. The instrument described below, in addition to being simple, is also robust and suitable for general test house use.

The purpose of this paper is to obtain analytic solutions of the (1+1) and (2+1)‐dimensional dispersive long wave equations by the homotopy analysis and the homotopy Padé methods.

The obtained approximation by using homotopy method contains an auxiliary parameter which is a simple way to control and adjust the convergence region and rate of solution series.

The approximation solutions by [m,m] homotopy Padé technique is often independent of auxiliary parameter ℏ and this technique accelerates the convergence of the related series.

In this paper, analytic solutions of the (1+1) and (2+1)‐dimensional dispersive long wave equations are obtained by the homotopy analysis and the homotopy Padé methods. The obtained approximation by using homotopy method contains an auxiliary parameter which is a simple way to control and adjust the convergence region and rate of solution series. The approximation solutions by [m,m] homotopy Padé technique are often independent of auxiliary parameter ℏ and this technique accelerates the convergence of the related series.

THE Wanstead Library is just round the corner from the shopping centre in the High Street where the old shop branch existed for many years. The new Library is a large, single‐storey structure with floor to ceiling windows facing Christchurch Green, a charming open space with well established trees. This spacious, attractive building is in complete contrast to the cramped accommodation previously occupied and local reaction has been emphatically favourable.

This study aims to examine the mediating role of “employees’ likelihood to voice (ELTV)” in the relationship between “online social networking (OSN)” and “employee retention (ER)” and to predict the effect of OSN on ELTV and ER.

A cross-sectional study using the survey method was employed to collect data from 251 administrative staff of the healthcare industry. The partial least squares (PLS) technique, using SmartPLS3 software, was employed to test the study hypotheses.

The results of this study supported the direct effect of OSN on ELTV and ER. Moreover, the mediating effect of ELTV was also supported by the data.

This study provides new knowledge about the direct and indirect effects of OSN on ELTV and ER.